Advanced Condensing boilers, the laymans guide
Advanced Condensing boilers, the laymans guide
A condensing boiler is a finance saving forward-looking boiler that incorporates an additional heat exchanger to enable the red-hot exhaust gases transfer most of their heat to pre warm the mains water to be heated. Once processing at peak efficiency, the water gases developed in the burning action turns revert back into a liquid freeing the latent heat of vaporisation.
A side effect will be this liquid, called condensate, which is usually acidic, has to be piped outside to a waste pipe or soakaway. The boiler should be mounted to a wall and the waste gases will go through the flue. Hot water is initialy served by a modest storage tank to help convenient and rapid hot water .
How can I get the right size of boiler?
In earlier years boiler installers filled larger boilers than were needed. Although this ensured that there was little chance of the boiler being unable to furnish sufficient hot water, even in the coldest wintertimes, it also meant that they were principally working at a reduced capacity, and so working in an inefficient mode. If you have insulated your property since the last boiler was fitted, it is highly likely that you will be commended to install a smaller boiler than the current one.
We certainly advocate you get advice from a CORGI installer before purchasing your next boiler
Do I need to set up outsize radiators with condensing boilers??
The main driver for smaller fuel consumption from a condensing boiler is because it carries a bigger heat exchanger. More Prominent radiators would result in cooler return water temperatures, and so enable greater energy efficiency, but the additional saving is not proven to be cost effective, as you need to remember that that the system is running at very low capacity for the majority of the heating season. Whilst this statement is correct homeowners would likely accept this in smaller properties.
The SEDBUK initiative looked at this, during which it was mooted whether condensing boilers required to be treated differently from others. The decision was that they need not, and the test results for both cases share the same SEDBUK equation.
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